Flush valve



July 29, 19.52 C, D, MYER 2,604,905

FLUSH VALVE Filed April 24, 1947 Patented July 29, 1952 Flushometer Co., Grantwood,.N. J., a, partnership composed of Claus D. Myer and Elizabeth Myer Application April Vai., 1947,"sei-ia1'No. 743,518

This inventionrelates to new and-useful imimprovements in flushing valves and has especial reference to improvements over the general type of valve shown in my U. S. Patent No. 1,722,155 issued to me July 23, 1929 and entitled Flush Valves.

An object of the invention is to provide a valve structure in which the parts are related to prevent solid material above certain sizes to pass into the valve while permitting the free passage of water therethrough.

A further object is to simplify the parts and reduce their number and thereby achieve simplicity and economy of operation, and manufacturing costs.

A still further object is to provide a device in which a valve and piston are combined in one unit to pass water and shut it oi and at the same time to control its flow and the time of stoppage after opening.

Further and more speciic objects, features,v

and advantages will more clearly appear from the detailed description hereinafter set forth especially when taken in connection with the accompanying drawings which illustrate 'a present preferred form which the invention may assume and which form part of the specification.

Briefly and generally stated, the invention includes a valve casing with a piston slidable therein and normally disposed against a valve seat,

with means to maintain balance of liquid pressure on both sides of the piston when the piston is seated, and manually-operated means to upset said balance whereby the piston is moved to permit passage of liquid through the seat.

Further, the invention includes a passage in the casing connecting both sides of the piston to permit water to freely flow from one side to the other, an opening in the piston, and a manually-operatedstem to close said opening and to expose it when operated whereby the balance is upset.` y

' Further, the invention includes a ring-plate around the piston of larger diameter than the piston to permit passage of material of predetermined size and thereby avoid clogging of the valve.

The present preferred form which the invention may assume is illustrated in the drawings, in which,

Fig. 1 is a vertical cross-section taken on the line I-I of Fig. 2;

Fig. 2 is a horizontal cross-section taken on the line 2-2 of Fig. 1;

Fig. 3 is a side elevation looking from the left in Fig. 1;

. 2 claims. (o1. 21371-665) e,

4ing 23 therein. This disk is tapered tobear in a Y 2 fFigLeis a plan view' of the device;

Fig. 5 is a modication of the invention. Referring now merely tothe specic forms of the invention shown in the drawing, it will be seen that the device'comprisesN a casting I0, having an inlet passage` II and an outlet passage `I2 and with-an open top I3. On top of casting I6 is seated a valve cylinder casing I4 having a bottom flange I4 resting on the top of casting i!) and a dependent rib I5 nested in a circular cut-out I6 in the casting IU and on a gasket ring I'rtherein to seal the connection. A diaphragm plate or ring .I8 is also held against gasket Il bythe valve casing I4 and its inner diameter is slightly larger than the outer diameter of a valve piston I9 slidable within the cylinder I4.- The-piston I9 is hollow and has afperforated ,plate 20. screwed to its top and rubber washers 2| held between the top of the lpiston and the plate-20, whichV washers frictionally engage the walls of the cylinder i4 and make a liquid tight joint, as the piston is moved up and down in the cylinder.`

At its bottom, the valve piston is provided with avalve element or disk 22 having a central opensimilarly-shaped recess in the bottom of the piston and is .held in placeby a ilangedthreaded ,ring-24 as shown. Avalve seat in the form 'of a pipe 25 is tight-iittedinto the casting `It) in line with Y thev outlet passage. I2 and the disk 22 `normally, rests on top of it.` when thervalve is closed, that is, when the water is not to flow .from the passage I I directly to the passage I2. 35

Ais the control opening and itis closed by a control valve stem 26 having ja tapered kand rounded :The opening23 in the centerA of valve disk 22 end to t into the openingy 23. g The upper end of the control stem slides-in small cylinder 2l dependent from a cap 28 screwed to thetop of the valve cylinder I4.= vA spring 29 surrounds the stem and the cylinder 2l and extends between the inner .surface of the cap 28 and a washer VV3|) resting on ja shoulder 3| on the stem 26 so that the stem is always urged downwardly by the spring. The stem is provided with a slot 32 into which projects an arm 33 on a shaft 34 extending through the cylinder casing I4 and having on its outer end a manually operable handle 35.

When the piston is at the bottom of its stroke it divides the cylinder casing I4 into anupper larger chamber 36 and a smaller lower chamber 31. A passage 38 in the wall of the casing I4 leads from the upper chamber 36 to the lower chamber 31, and the flow of uid therethrough 

